1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/* Test of ftell() function.
Copyright (C) 2007-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* None of the files accessed by this test are large, so disable the
fseek link warning if we are not using the gnulib fseek module. */
#define _GL_NO_LARGE_FILES
#include <stdio.h>
#include <string.h>
#include "macros.h"
#define TESTFILE "t-ftell3.tmp"
int
main (void)
{
FILE *fp;
/* Create a file with some contents. */
fp = fopen (TESTFILE, "w");
if (fp == NULL)
goto skip;
if (fwrite ("foogarsh", 1, 8, fp) < 8)
goto skip;
if (fclose (fp))
goto skip;
/* The file's contents is now "foogarsh". */
/* Try writing after reading to EOF. */
fp = fopen (TESTFILE, "r+");
if (fp == NULL)
goto skip;
if (fseek (fp, -1, SEEK_END))
goto skip;
ASSERT (getc (fp) == 'h');
ASSERT (getc (fp) == EOF);
ASSERT (ftell (fp) == 8);
ASSERT (ftell (fp) == 8);
ASSERT (putc ('!', fp) == '!');
ASSERT (ftell (fp) == 9);
ASSERT (fclose (fp) == 0);
fp = fopen (TESTFILE, "r");
if (fp == NULL)
goto skip;
{
char buf[10];
ASSERT (fread (buf, 1, 10, fp) == 9);
ASSERT (memcmp (buf, "foogarsh!", 9) == 0);
}
ASSERT (fclose (fp) == 0);
/* The file's contents is now "foogarsh!". */
remove (TESTFILE);
return 0;
skip:
fprintf (stderr, "Skipping test: prerequisite file operations failed.\n");
remove (TESTFILE);
return 77;
}
|
